1001 Space Earth Nature Evolution Fossils and Prehistoric Life Dinosaurs Simple Animals Insects and Spiders Fish Amphibians Reptiles Birds Sea Mammals Land Mammals Plant Kingdom How Plants Live Unusual Plants Ecology Conservation Animal Behaviour Pets and Farm Animals History Human World Science and Technology	How can you tell a tree's age? Every year a tree grows a new layer of wood beneath the bark. If a tree is cut down, its layers can be seen as rings on the surface of the stump. By counting the rings, you can tell the tree's age. Each ring in a stump's cross section represents a year's growth.   Previous: Back Book: 1001 Section: Nature Chapter: How Plants Live